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Physics 231 Topic 7: Oscillations Wade Fisher October 5-10 2012
Physics 231 Topic 7: Oscillations Wade Fisher October 5-10 2012

Dimensional Analysis and Correlations
Dimensional Analysis and Correlations

3. Force and Gravity
3. Force and Gravity

... and see what is going on. They were once used exclusively by the military, to try to see the secrets of adversaries, but now they are widely used by government and industry to look at everything from flooding and fires to the health of food crops. The ideal spy satellite would stay above the same lo ...
examkracker
examkracker

... Each chapter in this manual should be read three times: twice before the class lecture, and once immediately following the lecture. During the first reading, you should not write in tlle book. Instead, read purely for enjoyment. During the second reading, you should both mghlight and take notes in t ...
1 ACTIVITY FIVE NEWTON`S SECOND LAW: CONSTANT MASS
1 ACTIVITY FIVE NEWTON`S SECOND LAW: CONSTANT MASS

... moving along a flat, horizontal surface. The overall goal of this activity is for students to gain an understanding of the relationship between force, mass and acceleration. This will be accomplished by examining the change in acceleration that occurs when the applied force, exerted on an object, ch ...
CHAPTER 7: Linear Momentum Answers to Questions
CHAPTER 7: Linear Momentum Answers to Questions

... that a larger momentum change for the water has occurred than if it just came to a stop. And if there is a larger momentum change for the water, there will also be a larger momentum change for the ...
CHAPtER 2 Collisions and other interactions
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Transport Acceleration

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Transport Acceleration

Pearson Physics Level 30 Unit V Momentum and Impulse: Chapter 9
Pearson Physics Level 30 Unit V Momentum and Impulse: Chapter 9

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03BC VA-Kinem-Fall-Newt WS08

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... The physical quantity which gives the information about the position and direction of motion of particle in SHM at any instant from mean position is called phase. In general, the displacement of a particle in SHM can be written as Y = A sin(ωt ± φ ) , where (ωt ± φ ) is called phase, expressed in ra ...
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Ion heating resulting from pickup in magnetic reconnection exhausts

... with slow shocks. Alternate heating mechanisms are therefore explored. In section 3 the results of test particle simulations using the fields from the PIC simulations are presented. The trajectories reveal that the ions become demagnetized as they cross the exhaust boundary. Upon entering the exhaus ...
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Mass times velocity.

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Glossary of Biomechanical Terms, Concepts, and Units

nt2_Formal_Exercises - Glen Urquhart High School
nt2_Formal_Exercises - Glen Urquhart High School

... 5. State that weight per unit mass is the gravitational field strength. 6. Carry out calculations involving the relationship between weight, mass and gravitational field strength including situations where g is not equal to 10 N/kg. 7. State that the force of friction can oppose the motion of a body ...
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Exam 2

< 1 ... 14 15 16 17 18 19 20 21 22 ... 156 >

Specific impulse

Specific impulse (usually abbreviated Isp) is a measure of the efficiency of rocket and jet engines. By definition, it is the impulse delivered per unit of propellant consumed, and is dimensionally equivalent to the thrust generated per unit propellant flow rate. If mass (kilogram or slug) is used as the unit of propellant, then specific impulse has units of velocity. If weight (newton or pound) is used instead, then specific impulse has units of time (seconds). The conversion constant between these two versions is the standard gravitational acceleration constant (g0). The higher the specific impulse, the lower the propellant flow rate required for a given thrust, and in the case of a rocket, the less propellant needed for a given delta-v, per the Tsiolkovsky rocket equation.Specific impulse is a useful value to compare engines, much like miles per gallon or liters per 100 kilometers is used for cars. A propulsion method and system with a higher specific impulse is more propellant-efficient. While the unit of seconds can seem confusing to laypeople, it is fairly simple to understand as ""hover-time"": how long a rocket can ""hover"" before running out of fuel, given the weight of that propellant/fuel. Of course, the weight of the rocket has to be taken out of consideration and so does the reduction in fuel weight as it's expended; the basic idea is ""how long can any given amount of x hold itself up"". Obviously that must mean ""...against Earth's gravity"", which means nothing in non-Earth conditions; hence Isp being given in velocity when propellant is measured in mass rather than weight, and the question becomes ""how fast can any given amount of x accelerate itself?""Note that Isp describes efficiency in terms of amount of propellant, and does not include the engine, structure or power source. Higher Isp means less propellant needed to impart a given momentum. Some systems with very high Isp (cf. ion thrusters) may have relatively very heavy/massive power generators, and produce thrust over a long period; thus, while they are ""efficient"" in terms of propellant mass carried, they may actually be quite poor at delivering high thrust as compared to ""less efficient"" engine/propellant designs.Another number that measures the same thing, usually used for air breathing jet engines, is specific fuel consumption. Specific fuel consumption is inversely proportional to specific impulse and the effective exhaust velocity. The actual exhaust velocity is the average speed of the exhaust jet, which includes fuel combustion products, nitrogen, and argon, as it leaves air breathing engine. The effective exhaust velocity is the exhaust velocity that the combusted fuel and atmospheric oxygen only would need to produce the same thrust. The two are identical for an ideal rocket working in vacuum, but are radically different for an air-breathing jet engine that obtains extra thrust by accelerating the non-combustible components of the air. Specific impulse and effective exhaust velocity are proportional.
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